Does the AR support L2TP

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The AR supports L2TPv2 from V200R002C00.

Other related questions:
Does L2TP support NAT traversal
L2TP supports NAT traversal. L2TP uses UDP port 1701, so the destination port must be port 1701 when NATis used.

How many L2TP tunnels does an AR support
The number of L2TP tunnels supported by AR models is as follows: - AR120&AR150&AR160&AR200&AR500: 16 - AR510: 2 - AR1200, AR2201-48FE, AR2202-48FE, and AR2204: 128 - AR2220, AR2220L, AR2220E, AR2240 equipped with the SRU40 or SRU60, and AR3200 equipped with the SRU40 or SRU60: 512 - AR2240 equipped with the SRU80 or SRU100 and AR3200 equipped with the SRU80 or SRU100: 1024 - AR2240 equipped with the SRU200 and AR3200 equipped with the SRU200: 2048 (When the AR2240 or AR3200 equipped with the SRU200 functions as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups. The maximum value is 1024.) - AR3600 equipped with the SRUX5: 2048 (When the AR3600 equipped with the SRUX5 functions as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups. The maximum value is 1024.) - AR120-S&AR150-S&AR160-S&AR200-S: 16 - AR1200-S, AR2201-48FE-S, and AR2204-S: 128 - AR2220-S and AR2240-S: 512 - AR3200-S equipped with the SRU40: 512 - SRG1300 and SRG2304: 128 - SRG2320, SRG2320E, SRG3340 equipped with the SRUC or SRU40, and SRG3360 equipped with the SRUC or SRU40: 512 - SRG3340 equipped with the SRUF or SRU80 and SRG3360 equipped with the SRUF or SRU80: 1024 - SRG3340 equipped with the SRU200 and SRG3360 equipped with the SRU200: 2048 (When the SRG3340 or SRG3360 equipped with the SRU200 functions as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups. The maximum value is 1024.) - NE16EX-6 equipped with the MSP20 and NE16EX-8 equipped with the MSP20: 2048 (When the NE16EX-6 or NE16EX-8 equipped with the MSP20 functions as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups. The maximum value is 1024.) - NE16EX-6 equipped with the MSP40 and NE16EX-8 equipped with the MSP40: 4096 (When the NE16EX-6 or NE16EX-8 equipped with the MSP40 functions as the LAC, the maximum number of L2TP tunnels cannot exceed the number of L2TP groups. The maximum value is 1024.) - AR530: 16

Does the AR support the L2TP VPN accounting function
The AR does not support L2TP VPN accounting. After a user goes offline, accounting-stop packets are not sent. Therefore, the AR also does not support the accounting function of L2TP users on the RADIUS server. V200R007 and later versions support the accounting function through the RADIUS server.

Does an AR enabled with L2TP support RADIUS authentication
The L2TP Access Concentrator (LAC) and L2TP Network Server (LNS) support the RADIUS authentication (remote authentication) function to authenticate remote users. PPP sessions are initiated by user devices and received by the LNS. After being authenticated by the LNS, remote users successfully set up PPP sessions with the LNS and can access resources in the enterprise headquarters. As the other endpoint of an L2TP tunnel, the LNS is a peer device of the LAC, and sets up an L2TP tunnel with the LAC. Additionally, the LNS is the logical termination point of a PPP session; therefore, the PPP client (user device) and the LNS establish a virtual point-to-point link. An LAC provides PPP and L2TP processing capabilities on the packet switched network. The LAC establishes an L2TP connection with the LNS based on the user name or domain name in PPP packets so that PPP frames can be transmitted to the LNS.

Does the AR enabled with L2TP support RADIUS authentication
The LAC and LNS support RADIUS authentication (remote authentication) to authenticate remote users. The LNS terminates PPP sessions. After being authenticated by the LNS, remote users successfully set up PPP sessions with the LNS and can access resources in the enterprise headquarters. For L2TP negotiation, the LNS is the peer device of the LAC, and set up an L2TP tunnel with the LAC. Additionally, the LNS is the logical termination point of a PPP session; therefore, the PPP client (user device) and the LNS establish a virtual point-to-point link. An L2TP Access Concentrator (LAC) provides PPP and L2TP processing capabilities on the packet switched network. The LAC establishes an L2TP connection with the L2TP network server (LNS) based on the user name or domain name in PPP packets so that PPP frames can be transmitted to the LNS.

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